HIV/AIDS Flashcards
HIV
Human immunodeficiency virus
AIDS
Acquired Immune Deficiency
Transmition
Sexual intercourse
Blood
Mother to baby
Classification:
Based on…
1-3
Based on CD4+ lymph count
1 = >500 cells/mL
2 = 200-499 cells/mL
3 = <200 cells/mL
Detection
ELISA test
Detects anti-HIV antibodies
Most people develop antibodies after 3m
Detection
If +ve ELISA
Secondary tests would involve CD4+ T cell count and viral load
Progression
Typical
Rapid
Slow
Long term
Prevalence
36.9m worldwide
Highest Africa + SE Asia
HIV
Retrovirus
Can stay dormant so immune cells don’t notice
Attached to CD4+ glycoprotein receptor (found on immune cells)
HIV -> AIDS
Weakening immune system and allows opportunistic infections
CD4+ T-lymphocytes
Function (3)
Regulate many aspects of immune response
Control of activity of antibody-producing cells
Control activity of cell-mediated immune cells
Symptoms
Primarily as a result of conditions due to poor immune system
Affect nearly every organ system
Increased risk of developing cancers
WHO Classification
Stage 1
Asymptomatic
Normal activity
E.g. asymptomatic infection or acute retroviral infection
WHO classification
Stage 2
Symptoms but nearly fully mobile
Unintentional weight loss >10%
Recurrent upper respiratory tract infections
WHO classification
Stage 3
Bed more than normal
Chronic diarrhoea >1m
Fever >1m
Several bacterial infections